Spectroscopic characterization of the X(1+) and A(3+) states of CdNe, CdAr, CdKr, and CdXe

We report the spectroscopic characterization of the X(10+) and A(30+) states of CdNe, CdAr, CdKr, and CdXe. The van der Waals molecules were created in a free jet supersonic expansion and studied by low and high resolution laser-induced fluorescence. CdAr was also studied by dispersed fluorescence. A method of analyzing rotationally structured vibrational bands of overlapping isotopic spectral contributions is discussed. Spectroscopic parameters are obtained from computer simulations of CdNe and CdAr spectra and from analysis of vibrational isotope splittings for CdKr and CdXe. CdNe: r″e (X state)=4.26±0.05 Å, re(A state) =3.62±0.05 Å, D′e(A state) =77 cm−1; CdAr: r″e(X) =4.33±0.04 Å, r′e(A) =3.45±0.03 Å, De(A) =325 cm−1; CdKr: D′e(A) =513 cm−1 and CdXe: De(A) =1086 cm−1.